scholarly journals Obesity-induced diet leads to weight gain, systemic metabolic alterations, adipose tissue inflammation, hepatic steatosis, and oxidative stress in gerbils (Meriones unguiculatus)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e2967 ◽  
Author(s):  
Luciana L.A. Ventura ◽  
Nathália C.L. Fortes ◽  
Helton C. Santiago ◽  
Marcelo V. Caliari ◽  
Maria A. Gomes ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Hepatic Steatosis ◽  
Total Body Weight ◽  
Meriones Unguiculatus ◽  
The Body ◽  
Free Access ◽  
Standard Diet ◽  
Obese People ◽  
Tnf Α ◽  
Simple Carbohydrates

Background Nowadays, the number of obese people in the world has reached alarming proportions. During the expansion of adipose tissue, a number of functions such as activation and release of cytokines and hormones may be affected. This leads the body to a pro-inflammatory pattern, which may affect the proper functioning of many tissues. Thus, studying the mechanisms by which obesity induces physiological disorders is necessary, and may be facilitated by the use of animal models, in particular rodents. We sought to characterize the metabolic and adipose tissue changes resulting from a diet rich in fats and simple sugars in gerbils. Methods We divided 14 gerbils into two experimental groups that received a diet rich in simple carbohydrates and fats with 5,86 kcal/g (OB, n = 7) or a standard diet with 4.15 kcal/g (CT; n = 7) for 11 weeks. The animals had free access to water and food. The animal weight and food consumption were measured weekly. Blood, adipose tissue and liver of each animal were collected at the end of experiment. The following parameters were determined: cholesterol (COL), triglycerides (TGL) and glycemia (GLI) in the plasma; cytokines (IL-6, IL-10 and TNF-α) and hormones (adiponectin and leptin) in adipose tissue; activity of superoxide dismutase (SOD) and catalase (CAT), extraction and differentiation of fat and histology in liver. Results The consumption of a diet rich in simple carbohydrates and fats led to increased total body weight and increased relative weights of liver and adipose tissue. In addition, we observed increased fasting glucose levels and circulating triglycerides, along with high TNF-α production in adipose tissue and increased total fat, cholesterol and triglyceride contents in the liver, contributing to higher intensity of hepatic steatosis. On the other hand, the animals of this group showed depletion in the enzyme activity of SOD and CAT in the liver, as well as reduction of IL-10 and adiponectin levels in adipose tissue. Discussion High intake of saturated fat and simple carbohydrates establish the gerbil as an experimental model for the study of metabolic and hepatic abnormalities resulting from obesity.

scholarly journals Gerbils (Meriones unguiculatus) as a new experimental model of obesity induced by diet

2016 ◽  
Author(s):  
Luciana L A Ventura ◽  
Nathália C L Fortes ◽  
Helton C Santiago ◽  
Marcelo Vidigal Caliari ◽  
Maria A Gomes ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Experimental Model ◽  
Total Body Weight ◽  
Meriones Unguiculatus ◽  
The Body ◽  
Free Access ◽  
Standard Diet ◽  
Obese People ◽  
Tnf Α ◽  
Simple Carbohydrates

Background. Currently, the number of obese people in the world has reached alarming proportions. During the expansion of adipose tissue, a number of functions such as activation and release of cytokines and hormones may be affected. This causes the body to take a pro-inflammatory pattern, which may affect the proper functioning of many tissues. Thus, studying the mechanisms by which obesity induces physiological disorders is necessary, and may be facilitated by the use of animal models, in particular rodents. We sought to investigate whether the gerbil (Meriones unguiculatus) would be a good experimental model for the study of obesity and metabolic changes resulting from a diet rich in fats and sugars. Methods. 14 gerbils were divided according to weight into two experimental groups and received a a standard diet with 4,15kcal/g (CT; n = 7) or a diet rich in simple carbohydrates and fats with 5,86kcal/g (OB, n = 7) for 11 weeks. The animals had free access to water and food. The weight of each animal and food consumption of each cage were measured weekly and at the end of the experiment, blood, adipose tissue and liver were collected. The following parameters were determined: cholesterol (COL), triglycerides (TGL) and glycemia (GLI) in the plasma; cytokines (IL-6, IL-10 and TNF-α) and hormones (adiponectin and leptin) in adipose tissue; activity of superoxide dismutase (SOD) and catalase (CAT), extraction and differentiation of fat in the liver and liver histology. Results. The consumption of a diet rich in simple fats and carbohydrates led to an increase of total body weight, relative weights of liver and adipose tissue, glucose and triglycerides levels, and TNF-α concentration in adipose tissue. Animals of this group also showed a significant increase of total fat, cholesterol and triglyceride content in the liver, contributing to higher intensity of hepatic steatosis. On the other hand, depletion in the enzyme activity of SOD and CAT in the liver, as well as reduction of IL-10 and adiponectin levels were found in adipose tissue of these animals. Conclusion. Diet consumption consisting of an excess in saturated fat and simple carbohydrates establish the gerbil as an experimental model for the study of obesity and metabolic and liver abnormalities resulting from this disease.

scholarly journals Gerbils (Meriones unguiculatus) as a new experimental model of obesity induced by diet

2016 ◽  
Author(s):  
Luciana L A Ventura ◽  
Nathália C L Fortes ◽  
Helton C Santiago ◽  
Marcelo Vidigal Caliari ◽  
Maria A Gomes ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Experimental Model ◽  
Total Body Weight ◽  
Meriones Unguiculatus ◽  
The Body ◽  
Free Access ◽  
Standard Diet ◽  
Obese People ◽  
Tnf Α ◽  
Simple Carbohydrates

Background. Currently, the number of obese people in the world has reached alarming proportions. During the expansion of adipose tissue, a number of functions such as activation and release of cytokines and hormones may be affected. This causes the body to take a pro-inflammatory pattern, which may affect the proper functioning of many tissues. Thus, studying the mechanisms by which obesity induces physiological disorders is necessary, and may be facilitated by the use of animal models, in particular rodents. We sought to investigate whether the gerbil (Meriones unguiculatus) would be a good experimental model for the study of obesity and metabolic changes resulting from a diet rich in fats and sugars. Methods. 14 gerbils were divided according to weight into two experimental groups and received a a standard diet with 4,15kcal/g (CT; n = 7) or a diet rich in simple carbohydrates and fats with 5,86kcal/g (OB, n = 7) for 11 weeks. The animals had free access to water and food. The weight of each animal and food consumption of each cage were measured weekly and at the end of the experiment, blood, adipose tissue and liver were collected. The following parameters were determined: cholesterol (COL), triglycerides (TGL) and glycemia (GLI) in the plasma; cytokines (IL-6, IL-10 and TNF-α) and hormones (adiponectin and leptin) in adipose tissue; activity of superoxide dismutase (SOD) and catalase (CAT), extraction and differentiation of fat in the liver and liver histology. Results. The consumption of a diet rich in simple fats and carbohydrates led to an increase of total body weight, relative weights of liver and adipose tissue, glucose and triglycerides levels, and TNF-α concentration in adipose tissue. Animals of this group also showed a significant increase of total fat, cholesterol and triglyceride content in the liver, contributing to higher intensity of hepatic steatosis. On the other hand, depletion in the enzyme activity of SOD and CAT in the liver, as well as reduction of IL-10 and adiponectin levels were found in adipose tissue of these animals. Conclusion. Diet consumption consisting of an excess in saturated fat and simple carbohydrates establish the gerbil as an experimental model for the study of obesity and metabolic and liver abnormalities resulting from this disease.

scholarly journals Adipose Tissue Steroid Receptor RNA Activator 1 (SRA1) Expression Is Associated with Obesity, Insulin Resistance, and Inflammation

Cells ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2602
Author(s):  
Shihab Kochumon ◽  
Hossein Arefanian ◽  
Sardar Sindhu ◽  
Steve Shenouda ◽  
Reeby Thomas ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Serum Insulin ◽  
Subcutaneous Fat ◽  
Steroid Receptor ◽  
Obese People ◽  
Total Study Population ◽  
Metabolic Markers ◽  
Diabetes Status ◽  
Tnf Α ◽  
Study Population

Steroid receptor RNA activator 1 (SRA1) is involved in pathophysiological responses of adipose tissue (AT) in obesity. In vitro and animal studies have elucidated its role in meta-inflammation. Since SRA1 AT expression in obesity/type 2 diabetes (T2D) and the relationship with immune-metabolic signatures remains unclear, we assessed AT SRA1 expression and its association with immune–metabolic markers in individuals with obesity/T2D. For this, 55 non-diabetic and 53 T2D individuals classified as normal weight (NW; lean), overweight, and obese were recruited and fasting blood and subcutaneous fat biopsy samples were collected. Plasma metabolic markers were assessed using commercial kits and AT expression of SRA1 and selected immune markers using RT-qPCR. SRA1 expression was significantly higher in non-diabetic obese compared with NW individuals. SRA1 expression associated with BMI, PBF, serum insulin, and HOMA-IR in the total study population and people without diabetes. SRA1 associated with waist circumference in people without diabetes and NW participants, whereas it associated inversely with HbA1c in overweight participants. In most study subgroups AT SRA1 expression associated directly with CXCL9, CXCL10, CXCL11, TNF-α, TGF-β, IL2RA, and IL18, but inversely with CCL19 and CCR2. TGF-β/IL18 independently predicted the SRA1 expression in people without diabetes and in the total study population, while TNF-α/IL-2RA predicted SRA1 only in people with diabetes. TNF-α also predicted SRA1 in both NW and obese people regardless of the diabetes status. In conclusion, AT SRA1 expression is elevated in people with obesity which associates with typical immunometabolic markers of obesity/T2D, implying that SRA1 may have potential as a biomarker of metabolic derangements.

Abstract 1125: Mulberry Leaf Ameliorates The Production Of Adipocytokines By Inhibiting Oxidative Stress In White Adipose Tissue In db/db Mice

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Masayuki Sugimoto ◽  
Hidenori Arai ◽  
Yukinori Tamura ◽  
Toshinori Murayama ◽  
Koh Ono ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Metabolic Syndrome ◽  
Adipose Tissue ◽  
White Adipose Tissue ◽  
Metabolic Disorders ◽  
The Body ◽  
Mulberry Leaf ◽  
The Metabolic Syndrome ◽  
Pparγ Agonist ◽  
Tnf Α

Mulberry leaf (ML) is commonly used to feed silkworms. Previous study showed that ML ameliorates atherosclerosis. However, its mechanism is not completely understood. Because dysregulated production of adipocytokines is involved in the development of the metabolic syndrome and cardiovascular disease, we examined the effect of ML on the production of adipocytokines and metabolic disorders related to the metabolic syndrome, and compared its effect with that of a PPARγ agonist, pioglitazone (Pio). By treating obese diabetic db/db mice with ML, Pio, and their combination, we investigated the mechanism by which they improve metabolic disorders. In this study, db/+m (lean control) and db/db mice were fed a standard diet with or without 3% (w/w) ML and/or 0.01% (w/w) Pio for 12 weeks from 9 weeks of age. At the end of the experiment we found that ML decreased plasma glucose and triglyceride by 32% and 30%, respectively. Interestingly, administration of ML in addition to Pio showed additive effects; further 40% and 30% reduction in glucose and triglyceride compared with Pio treatment, respectively. Moreover, administration of ML in addition to Pio suppressed the body weight increase by Pio treatment and reduced visceral/subcutaneous fat ratio by 20% compared with control db/db mice. Importantly, ML treatment increased expression of adiponectin in white adipose tissue (WAT) by 40%, which was only found in db/db mice, not in control db/+m mice. Combination of ML and Pio increased plasma adiponectin concentrations by 25% and its expression in WAT by 17% compared with Pio alone. In contrast, ML decreased expression of TNF-α and MCP-1 by 25% and 20%, respectively, and the addition of Pio resulted in a further decrease of these cytokines by about 45%. To study the mechanism, we examined the role of oxidative stress. ML decreased the amount of lipid peroxides by 43% and the expression of NADPH oxidase subunits in WAT, which was consistent with the results of TNF-α and MCP-1. Thus our results indicate that ML ameliorates adipocytokine dysregulation by inhibiting oxidative stress in WAT of obese mice, and that ML may have a potential for the treatment of the metabolic syndrome as well as reducing adverse effects of Pio.

scholarly journals Anti-TNF-α Agent Tamarind Kunitz Trypsin Inhibitor Improves Lipid Profile of Wistar Rats Presenting Dyslipidemia and Diet-induced Obesity Regardless of PPAR-γ Induction

Nutrients ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 512 ◽  
Author(s):  
Fabiana M. C. Carvalho ◽  
Vanessa C. O. Lima ◽  
Izael S. Costa ◽  
Anna B. S. Luz ◽  
Fernando V. L. Ladd ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Food Intake ◽  
Visceral Adipose Tissue ◽  
Trypsin Inhibitor ◽  
Wistar Rats ◽  
Standard Diet ◽  
Ppar Γ ◽  
Tnf Α ◽  
High Glycemic Index ◽  
Visceral Adipose

: The increasing prevalence of obesity and, consequently, chronic inflammation and its complications has increased the search for new treatment methods. The effect of the purified tamarind seed trypsin inhibitor (TTIp) on metabolic alterations in Wistar rats with obesity and dyslipidemia was evaluated. Three groups of animals with obesity and dyslipidemia were formed, consuming a high glycemic index and glycemic load (HGLI) diet, for 10 days: Obese/HGLI diet; Obese/standard diet; Obese/HGLI diet + TTIp (730 μg/kg); and one eutrophic group of animals was fed a standard diet. Rats were evaluated daily for food intake and weight gain. On the 11th day, animals were anesthetized and sacrificed for blood and visceral adipose tissue collection. TTIp treated animals presented significantly lower food intake than the untreated group (p = 0.0065), TG (76.20 ± 18.73 mg/dL) and VLDL-C (15.24 ± 3.75 mg/dL). Plasma concentrations and TNF-α mRNA expression in visceral adipose tissue also decreased in obese animals treated with TTIp (p < 0.05 and p = 0.025, respectively) with a negative immunostaining. We conclude that TTIp presented anti-TNF-α activity and an improved lipid profile of Wistar rats with dyslipidemia and obesity induced by a high glycemic index and load diet regardless of PPAR-γ induction.

scholarly journals Effects of resveratrol on changes induced by high-fat feeding on clock genes in rats

2013 ◽  
Vol 110 (8) ◽  
pp. 1421-1428 ◽  
Author(s):  
Jonatan Miranda ◽  
María P. Portillo ◽  
Juan Antonio Madrid ◽  
Noemí Arias ◽  
M. Terasa Macarulla ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Protein Expression ◽  
Fatty Acid Synthase ◽  
Clock Genes ◽  
The Body ◽  
Control Group ◽  
Standard Diet ◽  
High Fat ◽  
Peripheral Tissues ◽  
Fat Feeding

In mammals, the main component of the circadian system is the suprachiasmatic nucleus in the hypothalamus. However, circadian clocks are also present in most peripheral tissues, such as adipose tissue. The aim of the present study was to analyse the potential effects of resveratrol on changes induced by high-fat feeding in the expression of clock genes and clock-controlled genes in the white adipose tissue from rats. For this purpose, rats were divided into three groups: a control group, fed a standard diet, and two other groups, either fed a high-fat diet supplemented with resveratrol (RSV) or no resveratrol (HF). The expression of clock genes and clock-controlled genes was analysed by RT-PCR. Protein expression and fatty acid synthase (FAS) activity were also analysed. When comparing the controls, the RSV group showed similar patterns of response to the HF group, except for reverse erythroblastosis virus α (Rev-Erbα), which was down-regulated. The expression of this gene reached the same levels as in control rats. The response pattern of protein expression forRev-Erbαwas similar to that found for gene expression. High-fat feeding up-regulated all adipogenic genes and resveratrol did not modify them. In the HF group, the activity of FAS tended to increase, while resveratrol decreased. In conclusion, resveratrol reverses the change induced by high-fat feeding in the expression ofRev-Erbαin adipose tissue, which means that clock machinery is a target for this polyphenol. This change seems to be related to reduced lipogenesis, which might be involved in the body fat-lowering effect of this molecule.

scholarly journals A Brief Overview of Oxidative Stress in Adipose Tissue with a Therapeutic Approach to Taking Antioxidant Supplements

Antioxidants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 594
Author(s):  
Shima Taherkhani ◽  
Katsuhiko Suzuki ◽  
Ruheea Taskin Ruhee
Keyword(s):  
Oxidative Stress ◽  
Adipose Tissue ◽  
Animal Studies ◽  
The Body ◽  
Fast Foods ◽  
Tnf Α ◽  
Excessive Consumption ◽  
Antioxidant Supplements ◽  
Factor Α ◽  
Necrosis Factor

One of the leading causes of obesity associated with oxidative stress (OS) is excessive consumption of nutrients, especially fast-foods, and a sedentary lifestyle, characterized by the ample accumulation of lipid in adipose tissue (AT). When the body needs energy, the lipid is broken down into glycerol (G) and free fatty acids (FFA) during the lipolysis process and transferred to various tissues in the body. Materials secreted from AT, especially adipocytokines (interleukin (IL)-1β, IL-6, and tumor necrosis factor-α (TNF-α)) and reactive oxygen species (ROS), are impressive in causing inflammation and OS of AT. There are several ways to improve obesity, but researchers have highly regarded the use of antioxidant supplements due to their neutralizing properties in removing ROS. In this review, we have examined the AT response to OS to antioxidant supplements focusing on animal studies. The results are inconsistent due to differences in the study duration and diversity in animals (strain, age, and sex). Therefore, there is a need for different studies, especially in humans.

scholarly journals The influence of retrobulbar adipose tissue volume upon intraocular pressure in obesity

2013 ◽  
Vol 70 (5) ◽  
pp. 469-476 ◽  
Author(s):  
Oliver Stojanov ◽  
Edita Stokic ◽  
Olivera Sveljo ◽  
Nada Naumovic
Keyword(s):  
Adipose Tissue ◽  
Intraocular Pressure ◽  
Normal Weight ◽  
The Body ◽  
Composition Analysis ◽  
Obese People ◽  
Tissue Volume ◽  
Elevated Intraocular Pressure ◽  
Obese Subjects ◽  
Adipose Tissue Volume

Background/Aim. It is known that glaucoma is associated with elevated intraocular pressure and obesity, yet the precise etiology remains unclear. The aim of this study was to determine whether there is a potential causality between the volume of retrobulbar adipose tissue and the level of intraocular pressure in obese subjects compared with non-obese. Methods. A total of 100 subjects were divided according to the body mass index (BMI), into two groups: normal weight (n = 50, BMI = 18-24.9 kg/m2) and obese (n = 50, BMI ? 30 kg/m2) subjects. Anthropometric measurements, body composition analysis, measurement of intraocular pressure, as well as magnetic resonance imaging (MRI) of the head at the level of the optic nerve, and the derived retrobulbar adipose tissue volume, were undertaken in all subjects. Results. The obese subjects, as compared with normal weight ones, had a significantly higher mean retrobulbar adipose tissue volume (6.23 cm3 vs 4.85 cm3, p < 0.01) and intraocular pressure (15.96 mmHg vs 12.99 mmHg, p < 0.01). Furthermore, intraocular pressure correlated positively with retrobulbar adipose tissue volume. Conclusion. In obese people, elevated intraocular pressure may be caused by changes in ocular blood flow, affected by the physical pressure exerted by higher retrobulbar adiposity, and/or by internal vascular changes secondary to complications of obesity. These findings indicate the need for more frequent measurement of intraocular pressure in obese individuals to earlier detect glaucoma, and in so doing prevent irreversible blindness.

scholarly journals Effects of exercise and low-fat diet on adipose tissue inflammation and metabolic complications in obese mice

2009 ◽  
Vol 296 (5) ◽  
pp. E1164-E1171 ◽  
Author(s):  
Victoria J. Vieira ◽  
Rudy J. Valentine ◽  
Kenneth R. Wilund ◽  
Nirav Antao ◽  
Tracy Baynard ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Adipose Tissue ◽  
Hepatic Steatosis ◽  
Adipose Tissue Inflammation ◽  
Obese Mice ◽  
Metabolic Disturbances ◽  
Low Fat ◽  
Tissue Inflammation ◽  
Low Fat Diet ◽  
Tnf Α

Adipose tissue inflammation causes metabolic disturbances, including insulin resistance and hepatic steatosis. Exercise training (EX) may decrease adipose tissue inflammation, thereby ameliorating such disturbances, even in the absence of fat loss. The purpose of this study was to 1) compare the effects of low-fat diet (LFD), EX, and their combination on inflammation, insulin resistance, and hepatic steatosis in high-fat diet-induced obese mice and 2) determine the effect of intervention duration (i.e., 6 vs. 12 wk). C57BL/6 mice ( n = 109) fed a 45% fat diet (HFD) for 6 wk were randomly assigned to an EX (treadmill: 5 days/wk, 6 or 12 wk, 40 min/day, 65–70% V̇o2max) or sedentary (SED) group. Mice remained on HFD or were placed on a 10% fat diet (LFD) for 6 or 12 wk. Following interventions, fat pads were weighed and expressed relative to body weight; hepatic steatosis was assessed by total liver triglyceride and insulin resistance by HOMA-IR and glucose AUC. RT-PCR was used to determine adipose gene expression of MCP-1, F4/80, TNF-α, and leptin. By 12 wk, MCP-1, F4/80, and TNF-α mRNA were reduced by EX and LFD. Exercise ( P = 0.02), adiposity ( P = 0.03), and adipose F4/80 ( P = 0.02) predicted reductions in HOMA-IR ( r2 = 0.75, P < 0.001); only adiposity ( P = 0.04) predicted improvements in hepatic steatosis ( r2 = 0.51, P < 0.001). Compared with LFD, EX attenuated increases in adiposity, hepatic steatosis, and adipose MCP-1 expression from 6 to 12 wk. There are unique metabolic consequences of a sedentary lifestyle and HFD that are most evident long term, highlighting the importance of both EX and LFD in preventing obesity-related metabolic disturbances.

scholarly journals Mechanism of Physical Exercise on Lowering Levels of C-Reactive Protein (CRP) in Overweight and Obese

2021 ◽  
Vol 57 (1) ◽  
pp. 82
Author(s):  
Muchammad Rif’at Fawaid As’ad ◽  
Paulus Liben ◽  
Lilik Herawati
Keyword(s):  
Adipose Tissue ◽  
Physical Exercise ◽  
Overweight And Obesity ◽  
The Body ◽  
Inflammatory Factors ◽  
C Reactive Protein ◽  
Reactive Protein ◽  
Increase Energy Expenditure ◽  
Tnf Α ◽  
Anti Inflammatory

Cases of overweight and obesity in the world increased continuously. In 2016, obesity increased by 3% in men and 6% in women compared to 1975. Overweight cases also increased by 20% in men and 23% in women compared to 1975. Overweight and obesity have been linked to an increase in adipose tissue in the body. Increased adipose tissue associated with inflammation, which one of its characteristics is an increase levels of C - Reactive Protein (CRP). This article aim is to describe the mechanism of physical exercise to diminish CRP level in overweight and obesity. Adipose tissue produces and releases various pro-inflammatory and anti-inflammatory factors such as leptin, adiponectin, resistin, TNF-α, IL-6, MCP-1 and CRP. One of the prevention and treatment of inflammatory for overweight and obesity cases is to do physical exercise. In cases of overweight and obesity, the physical exercise aims to increase energy expenditure. Physical exercise decreases the volume and amount of adipose and pre-adipose tissue as well as the number of endothelial cells and macrophages in adipose that contain pro-inflammation such as IL-1, TNF-α, CRP, serum amyloid protein (SAA), and cytokines. Physical exercise rises anti-inflammatory properties such as IL-10, IL-1ra which play a role in inhibiting the transduction of IL-1β signals and inhibiting TNF-α synthesis. Physical exercise also amplifies antioxidant enzymes such as SOD and GPX. The antioxidants play a role in fighting free radicals to reduce inflammation.

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